Cylinder hone or lapping tool



Spt. 22,l 1925. 1554,760

v T. BESTEL.

CYLINDER HONE OR LAPPING TQOL Filed June 1s.l '1924 2 sheets-snm 1 INVENTOR.

ATTORNEY.

Sept. 22, 1925. Y. 1,554,760

T. RESTEL CYLINDER HONE 0R LAPPING TOOL Filed June 1e. 1924' 2 sheets-sheet 2 IN VEN TOR.

A TTORNE Y.

' Patented Sept. 22, 1925 FICE.

THEODORE BESTEL, F CLEVELAND, OHIO.

CYLINDER HONE OR LAPZPING TOOL.

Application led June 16, 1924. Serial No. 720,394.

embodied in my co-pendlng application Serial Number 696,206 filed March 1, 1924, and has for an object to provide means whereby small bore cylinders may be accurately honed, this being practically impossible with the present tools available and due to the impractibility of making up a small too-l in accordance with the disclosure in the above identified application, a new and differently constructed hone is absolutely essential.

Another object is to provide a hone of this character wherein a set of radially movable cutters is adjustable b. means of a single mandrel or cone mem er, which may be readily adjusted to permit honing of cylinders varying slightly in diameter.

It is likewise an object to provide a hone of this nature wherein the cutters or honing members each carry a pair of spaced alined inclined faces engageable with a single mandrel o-r expanding member for radially adjusting the cutters.

Other objects will be in part obvious and in part pointed out hereinafter.

In order that the invention and its mode of construction and functioning may be readily understood I have in the accompanying drawings and the following specification and claims based thereon set out the preferred embodiment of the cylinder hone.

In these drawings.

Figure 1 is a side elevation of the. hone;

Figure 2 is a vertical sectional view taken substantially on the line 2 2 of Figure l;

Figure 3 is a transverse sectional view taken substantially on the line 2%*3 of Figure 1;

Figure 4 is a transverse sectional view taken substantially on the line I+-4 of Figure 1' Figure 5 is a detail view of the slotted stock with the cutters removed; v

Figure 6 is a detail view of the mandrel and i Figure 7 is an elevation of one cutter.

`In the accompanying drawings, throughout which similar reference characters designate similar parts, the hone is shown as including broadly, a slotted stock mounting a set of radially adjustable cutters or honing members which are movable under influence of an axially adjustable mandrel or cone expanding member, this mandrel being moved through rotation of a nut at one end of the hone. A control cam lever is arranged at one end to allow for additional expansion of the hone afterl it is positioned within a cylinder, thereby snugly engaging the cutters with the face to be honed. f

This slotted stock which carries the several parts making up the hone comprises an elongated cylindrical body, approximately one-half of whose length is reduced in diameter and threaded for reasons which are apparent.

Obviously, the number of cutters or honing members may be varied, but for the purpose of this application I have shown four, which are arranged in circumferentially spaced radial slots 10 opening into the hollow interior of the stock. Opposed end walls of these slots 10 are provided with radially extending grooves or channels 11 designed to engage portions of the cutter carriers as will be hereinafter described. An annular inclined face 12 is formed at the juncture of the threaded portion of the stock and the cutter mounting portion for the purpose of limiting the axial adjustment of a locking collar or ring 13 over the adjacent ends of the cutter carriers. This locking collar or ring 13 is threaded upon the diametrically. reduced portion of the stock and has an inclined or beveled end 14 engageable with the annular `inclined face 12 and with the inner ends of the cutter carriers as stated.

The reduced threaded portion of the stock is provided intermediate its ends with a pair of diametrically opposed longitudinal slots 15 which receive crosspins whose i functions will be hereinafter apparent. A double universal joint J is connected to they end of the threaded portion of the stock as shown in Figure 2 of the drawings. The structure of this jointJ is similar to that in my application herein referred to. l

Each honing member or cutter 16 includes a metal carrier 17 in the form of ya bar cupped or channeled to receive a carn... hD

i formed upon the ends of the carriers 17 and are designed to snugly and slidably fit within channels or grooves 11 in the hone receiving slots as previously stated. The -aforementioned locking collar or ring 13' takes over the adjacent or inner ribs 19 and consequently prevents accidental displacement off the lcarriers 17 The inner face of each carborundum carrier 17 is thickened at one end and is beveled longitudinally from a vpoint near the outer end of the thickened portion to the opposite end. Obviously this Vbevel 17 is curved transversely to conform .to the curvature of the mandrel or expansion cone member. The portions 17 of each carborundum carrier 17 which contact with the mandrel are spaced apart longitudinally through cutting out a section ofthe metal and providing an undercut shoulder 20. This undercut shoulder isx formed to receive a collar which in turn is engaged by the expansion cone so the cutters may be forced against the end of the stock to retain the .carborundum faces in position for dressing. Ordinarily there is no ring enlgxaging the undercut shoulders.

mandrel or expansion cone member 21 is formed from a length of metal which is tapered from a point substantially midway its length to one end, thus forming the cone 22 which engages the bevels of the cutter carriers 17. The cone shaped portion is of substantially the same length as the beveled part of the lione carrier 17 and consequently there is assured equal adjustment of both ends of the hone, and the necessary rigidity.'

'This mandrel is hollow from the juncture ofthe cone shaped part andthe body portion, to its otherl end and is provided with a pair of diametrically opposedlongitudinal slots 23 as shown, and for purposes which will be apparent. This mandrel or expansion cone member 21 is movable axially to adjust the cutter, through rotation of an adjusting ring or collar 24 arranged uponthe `threaded portion of the clotted stock. A

cross-pin 25 has its ends covered by the collar 24 which is substantially L-sliaped in cross-section and 4is at all times snugly engaged with the cross-pin. This cross-pin 25 extends through the slots formed in the mandrel and threaded portion of the slotted stock. A coil expansion spring 26 is arranged in the hollow portion of the mandrel and serves as a connection between the crosspin and mandrel for purposes of adjustment,

vit being apparent in Figure 2 that rotation of the ring or collar 24 will move the mandrel longitudinally and consequently radially move the cutters. Thismeans allows the operator to vary the diameter so it may be inserted into a cylinder to be honed.

Obviously in order to hone a. cylinder the tween its ends a metal block 29, snugly fitting in the end of the hollow mandrel body. This block 29 is provided with an annular fiange 30 which engages the end of the mandrel body as shown in Figure 2. A spring actuated plunger or ball 31 is arranged in this block 29 and is seatable in a recess formed in the second cross-pin so as to retain the cam lever in either of its adjusted positions.

. When a cylinder is to be honed with this tool, the adjusting nut is rotated until the cutters are radially adjusted to a point whereat they may be inserted into the cylinder freely. During this operation the cam lever is positioned to compress the spring and space the first cross-pin from the block fitted in the end of the mandrel. When the hone is properly positioned in the cylinder, the lever is tripped and the coil spring is allowed to expand and consequently moves the cutters into snug engagement with the cylinn der wall. f' The honing having been completed, the lever is again moved to contract lthe cutters and the hone is removed from the cylinder. Ordinarily this operation is long and tedious as compared with the above stated operation.

As pointed out in my application herein referred to, the provision of a double universal joint, rather than a single universaljoint or a rigid connection to a driveshaft, eliminates entirely the tendency of the hone to slapand inaccurately finish the cylinder.

Manifestly certain minor changes in the details ofl construction may be resorted to and such changes as fall within the scope of. the appended claims, I consider within the spirit of my invention.

I claim: 1. A cylinder hone comprising a hollow stock having a set of. longitudinal slots extending from one end to a point substantially midwayl the length of the stock, said stock being externally threaded beyond the cutter receiving slots, a set of cutters arranged in the slots, bevele'dhfaces formed upon the inner side of the cutters, an expansion cone member engaging the beveled portions of the cutters, a hollow extensioncarried b the cone member,.said extension and threa ed portion of the stock having alined opposed slots, an adjusting ring arranged upon the threaded portion of the stock, and devices inthe hollow extension and opposed lao slots between the ring and cone member to axially move the cone with rotation of said ring.

2. A cylinder hone comprising a hollow stock having a set of longitudinal slots eX- tending from one end to a point substantially midway the length of the stock, said stock being externally threaded beyond the cutter receiving slots, a set of cutters arranged in the slots, beveled faces formed upon the inner side of the cutters, an expansion cone member engaging the beveled portions of the cutters, a hollow extension carried by the cone member, said extension and threaded portion of the stock having alined opposed slots, an adjusting ring arranged upon the threaded portion of the stock, a cross-pin extending through the slots, and a coil expansion springvengaging the crosspin, and the'base of the cone member, said ring being rotatable to move the cross-pin longitudinally and adjust the cutters.

3. A cylinder hone comprising a'hollow stock having a set of longitudinalslots eX- tending from one end to a point substantially midway the length of the stock, said stock being externally threaded beyond the cutter receiving slots, a set of cutters arranged in the slots, beveled faces formed upon the inner side of the cutters, an expansion cone member engaging the beveled portionsof the cutters, a hollow extension carried by the cone member, said extension and threaded portion of the stock having alined opposed slots, spring means for exially moving the cone member to` radially adjust the cutters for positioning the hone in a cylinder, a cross-pin in the slots bearing against the spring and a cam lever mechanism for expanding the cutters into contact with acylinder wall.

4. A cylinder hone comprising a hollow stock having a set of longitudinal slots extending rom one end to a point substantial? ly midway the length of the stock, said stock being externally threaded beyond the cutter receiving slots, a set of cutters arranged in the slots, beveled faces formed upon the inner side of the cutters, an expansion cone member engaging the beveled portions of the cutters, a hollow extension carried by the cone member, said extension and threaded portion of the stock having alined opposed slots, an adjusting ring arranged upon the Vthreaded portion of the stock, an expansion coil sprin in the hollow extension, a cross-pin in the opposed slots bearing againstthe spring, and a camlever actthe ing upon the adjusting ring and operable to expand the cutters into contact with the face of a cylinder to be honed.

5. A cylinder hone comprising a hollow stock having a set of longitudinal slots extending from one end to a point substantially midway the length of the stock, said stock being externally threaded beyond the cutter receiving slots, a set of cutters arranged in the slots, beveled faces formed upon the inner side of the cutters, an expansion cone member engaging the beveled portions of the cutters, a hollow extension carried by cone member, said extension and threaded portion of the stock having alined opposed slots, an adjusting rin arranged upon the threaded portion of tie stock, a cross-pin extending through the slots, a coil expansion spring engaging the cross-pin, and the cone member, said ring being rotatable to move the cross-pin longitudinally and adjust the cutters, a Second cross-pin arranged in the slots and connected to said extension for longitudinal movement therewith, a cam carried by the second cross-pin and engageable with the adjusting ring whereby to permit quick expansion of the cutters after being positioned within a cylinder to be honed.

6. A cylinder hone comp-rising a hollow stock, radially movable cutters, an expansion cone in the stock, telescopically arranged hollow extensions on the stocl and cone, means for preventing relative rotary movement of the extensions, while permitting relative axial movement, a coil expansion spring carried by the cone to move it axially in the stock to vary the cutter adjustment, and adjusting rings engaging said means tovary the spring tension. j'

7. A cylinder hone vcomprising a. hollow stock, a set of radially adjustable removable cutters carried by the stock, an expansion cone arranged in the stock, beveled faces formed on the cone member and cutters, an externally threaded hollow extension on the stock, a hollow extension carried by the cone member and arranged in the hollow stock extension, ranged to prevent relative rotary movement of the extensions, a spring arranged in the cone member in engagement with the crosspin to move the cone axially and expand the cutters, and means for shifting the pin longitudinally.

In testimony whereof, I afix my signature.`

THEODORE BESTEL.

inter-engaging 

